Development of the Periodic Table

Question 1

Early periodic tables were arranged by

Answer 1

atomic weight

Question 2

Mendeleev arranged the elements by

Answer 2

atomic weight and similar properties

Question 3

Mendeleev left gaps of

Answer 3

undiscovered elements and predicted their properties

Question 4

Modern periodic table arranged by

Answer 4

atomic (proton) number

Question 5

Elements with similar properties are in

Answer 5

groups